381965309 has 8 divisors (see below), whose sum is σ = 416885952. Its totient is φ = 347077440.

The previous prime is 381965281. The next prime is 381965323. The reversal of 381965309 is 903569183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381965309 - 2⁸ = 381965053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381965309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381965369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20597 + ... + 34469.

It is an arithmetic number, because the mean of its divisors is an integer number (52110744).

Almost surely, 2^381965309 is an apocalyptic number.

It is an amenable number.

381965309 is a deficient number, since it is larger than the sum of its proper divisors (34920643).

381965309 is a wasteful number, since it uses less digits than its factorization.

381965309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16387.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 381965309 is about 19543.9327925574. The cubic root of 381965309 is about 725.5621855935.

The spelling of 381965309 in words is "three hundred eighty-one million, nine hundred sixty-five thousand, three hundred nine".